نتایج جستجو برای: paddy

تعداد نتایج: 6778  

2017
Mohd Zulhilmi Ab Jamil Sofianita Mutalib Shuzlina Abdul Rahman Zalilah Abd Aziz

The productivity of paddy rice in Malaysia has improved as the technology advances. However, several concerns need to be considered to maintain the productivity. The growth of paddy weeds in the fields is one of the concerns that need to be taken care of as it resulted to the decrease of the paddy yield. This paper presents an integrated method for classifying paddy weeds through the shape of t...

2002
Changsheng Li Jianjun Qiu Steve Frolking Xiangming Xiao William Salas Berrien Moore Steve Boles Yao Huang Ronald Sass

[1] Decreased methane emissions from paddy rice may have contributed to the decline in the rate of increase of global atmospheric methane (CH4) concentration over the last 20 years. In China, midseason paddy drainage, which reduces growing season CH4 fluxes, was first implemented in the early 1980s, and has gradually replaced continuous flooding in much of the paddy area. We constructed a regio...

2012
Xiaohe Gu Jingcheng Zhang Peng Xu Yingying Dong Yansheng Dong

It is significant to monitor crop waterlogging range timely and correctly for later field management, agricultural insurance and yield prediction. The change regularity of paddy injured growth was analyzed and the sensitive parameters of growth stress were screened. The model of identifying the paddy waterlogging range based on change vector analysis (CVA) was developed by using the HJ-1/2 CCD ...

2016
Xinzhen Wang Junjie Liu Zhenhua Yu Jian Jin Xiaobing Liu Guanghua Wang

Although bacteriophages are ubiquitous in various environments, their genetic diversity is primarily investigated in pelagic marine environments. Corresponding studies in terrestrial environments are few. In this study, we conducted the first survey of phage diversity in the paddy ecosystem by targeting a new viral biomarker gene, phoH. A total of 424 phoH sequences were obtained from four padd...

Journal: :The Science of the total environment 2017
Geli Zhang Xiangming Xiao Chandrashekhar M Biradar Jinwei Dong Yuanwei Qin Michael A Menarguez Yuting Zhou Yao Zhang Cui Jin Jie Wang Russell B Doughty Mingjun Ding Berrien Moore

Due to rapid population growth and urbanization, paddy rice agriculture is experiencing substantial changes in the spatiotemporal pattern of planting areas in the two most populous countries-China and India-where food security is always the primary concern. However, there is no spatially explicit and continuous rice-planting information in either country. This knowledge gap clearly hinders our ...

2001
Wataru TAKEUCHI Yoshifumi YASUOKA Masayuki TAMURA

Since the rapid increase in atmospheric methane was recognized in the early 1980’s, paddy fields have been considered to be one of the likely and most important sources of this problem. The objective of this study is to estimate the methane emission from paddy fields with remotely sensed data and the methane flux in situ. In this paper, firstly, we developed a scaling technique to extrapolate t...

2010
Xin Chen Li-Mei Zhang Ju-Pei Shen Zhihong Xu Ji-Zheng He Hailong Wang X. Chen

Purpose Ammonia oxidation plays an important role in global nitrogen cycle. However, little information is available on ammonia oxidizers in paddy soils. This study aimed to understand the controlling factors of ammonia oxidizers in the paddy soils. Materials and methods Three types of paddy soils were collected from southwest [Chongqing City (CQ)], central [Honghu City (HH)], and northeast [Pa...

2016
Md Rokunuzzaman Yumiko Ueda Li Chen Sota Tanaka Kouhei Ohnishi

Soil bacterial community structures in terraced rice fields and abandoned lands in a hilly and mountainous area were analyzed using 16S rRNA gene sequences. The DGGE band patterns of each soil were similar. Based on pyrosequencing data, the richness and diversity of bacterial species were slightly higher in paddy fields than in other soils. A beta-diversity analysis clearly indicated that the b...

Journal: :JCS 2017
Tb. Ai Munandar Sumiati

Corresponding Author: Tb Ai Munandar Department of Informatics Engineering, Faculty of Information Technology, Universitas Serang Raya, Banten, Indonesia Email: [email protected], [email protected] Abstract: Nowadays, agricultural field is experiencing problems related to climate change that result in the changing patterns in cropping season, especially for paddy and coarse grains, pulses...

2015
Jie Wang Xiangming Xiao Yuanwei Qin Jinwei Dong Geli Zhang Weili Kou Cui Jin Yuting Zhou Yao Zhang

As farmland systems vary over space and time (season and year), accurate and updated maps of paddy rice are needed for studies of food security and environmental problems. We selected a wheat-rice double-cropped area from fragmented landscapes along the rural-urban complex (Jiangsu Province, China) and explored the potential utility of integrating time series optical images (Landsat-8, MODIS) a...

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